Astrophysics

Stellar cluster populations in the Local Universe show a wide range of properties, suggesting that these objects form via a unique physical channel, and that their demographics are shaped by their formation and evolution in an evolving cosmic...

A rich variety of wave phenomena exist in virtually every region of the geospace environment.  Understanding of the various wave signatures and driving mechanisms provided insight into the local conditions, not only at the instant that the waves are...

Abstract: What happens when two masses scatter?  This deceptively simple question has produced a series of surprises that touch on deep issues in general relativity, such as the localizability of gravitational field energy, the notion of asymptotic...

Abstract 1: Despite the success of LCDM model, there is a growing tension between measurements of the current expansion rate from the local distance ladder and from the cosmic microwave background (CMB). Known as the $H_0$ tension, this...

I will present results from the Planet Hunters TESS (PHT) project, which harnesses the power of citizen science to find transit events in the TESS data by engaging tens of thousands of volunteers. To date, PHT volunteers have classified all two...

Each week, we hold a relatively informal seminar/discussion series with an emphasis on extra-galactic and large-scale structure astrophysics.

During Galread a leader/visitor presents a recent paper to the discussion group. The PDF of the paper is...

Pulsars produce coherent radio emission, the source of which has remained enigmatic. Recent computational work suggests this emission may be produced in nonstationary pair plasma discharges in the pulsar polar cap, where the pulsar electric field is...

Large luminous galaxies like the Milky Way grow in mass hierarchically through accretion and merging. Diffuse stellar halos around galaxies are formed primarily thanks to this process, and thus encode unique information about the merger history of...

With thousands of known transiting exoplanets, many as small as the Earth, our detection capabilities are beginning to border on that necessary to detect the largest moons found in our solar system. Exomoons would offer new opportunities to...